Dell Vostro 410 (Late 2008) - Manual (Page 31)

Align the notch on the bottom of the module with the crossbar in the connector.
.
2. Insert the module into the connector until the module snaps into position.
If you insert the module correctly, the securing clips snap into the cutouts at each end of the module.
3. Perform the steps in the procedure After Working on Your Computer .
4. Log on to your computer.
5. Right-click the My Computer icon on your Windows desktop and click Properties.
6. Click the General tab.
7. To verify that the memory is installed correctly, check the amount of memory (RAM) listed.
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1 Pair A: matched pair of memory
modules in connectors DIMM_1
and DIMM_2
2 Pair B: matched pair of memory
modules in connectors DIMM_3
and DIMM_4
1 cutouts (2) 2 memory module
3 notch 4 crossbar
NOTICE: To avoid damage to the memory module, press the module straight down into the connector while you apply equal force to each end of the
module.